Extended Streamflow Prediction
Issued by NWS

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429
FGUS65 KSTR 031706
ESPWY
COLORADO BASIN RIVER FORECAST CENTER
NATIONAL WEATHER SERVICE SALT LAKE CITY UTAH

                      WATER SUPPLY INFORMATION FOR
                            SOUTHWEST WYOMING
                                 AS OF
                             May 3, 2019


PRECIPITATION(% OF AVERAGE) AND SNOWPACK (% OF MEDIAN):

SUBBASIN                   APR      OCT-APR      MAY 1       APR
                          PRECIP     PRECIP      SNOW        FLOW
----------------------    ------     -------     -----     --------
GREEN ABV FLAMING GORGE     130        105        100         160
BEAR RIVER HEADWATERS       140        115        125         110

RESERVOIR STORAGE (KAF) AS OF APRIL 30, 2019
Figures are in 1000 Acre Feet

                           C U R R E N T   Y R              L A S T   Y R
                           Usable     EOM Usable % of       EOM Usable   % of
                           Capacity   Contents   Capacity   Contents     Capacity
----------------------------------------------------------------------------------
   GREEN - FONTENELLE RE|      344.8|       136.6|     40|       130.4|        38|
   BIG SANDY - BIG SANDY|       38.3|        22.0|     58|        35.8|        93|
   BLACKS FORK - MEEKS C|       29.9|        11.9|     40|        18.4|        62|
   EF SMITHS FORK - STAT|       13.9|         5.5|     39|         7.6|        55|
   GREEN - FLAMING GORGE|     3749.0|      3302.6|     88|      3185.8|        85|
   BEAR - WOODRUFF NARRO|       55.8|        57.9|    104|        59.0|       106|


STREAMFLOW FORECASTS:

GREEN RIVER BASIN
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Green River
  Daniel, nr, Warren Brid  Apr-Jul    205    84    245    225    191    160    245
  Daniel, nr, Warren Brid  May-Jul    188    84    230    210    174    143    225
Pine Ck
  Fremont Lk, abv          Apr-Jul     95    97    110     99     89     78     98
  Fremont Lk, abv          May-Jul     92    96    107     96     86     75     96
New Fork River
  Big Piney, nr            Apr-Jul    360   101    460    380    335    275    355
  Big Piney, nr            May-Jul    330   100    430    350    305    245    330
Green River
  Fontenelle Reservoir, F  Apr-Jul    740   102    915    810    680    565    725
  Fontenelle Reservoir, F  May-Jul    625    98    800    695    565    450    640
Big Sandy River
  Farson, nr               Apr-Jul     55   106     70     60     49     41     52
  Farson, nr               May-Jul     50   104     65     55     44     36     48
Green River
  Green River, Wy, nr      Apr-Jul    740   101    935    815    690    550    730
  Green River, Wy, nr      May-Jul    630    98    825    705    580    440    640
EF Smiths Fork River
  Stateline Res, Robertso  Apr-Jul     30   115     37     32     27     25     26
  Stateline Res, Robertso  May-Jul     28   108     35     30     25     23     26
Blacks Fork River
  Robertson, nr            Apr-Jul     94   106    114     99     85     73     89
  Robertson, nr            May-Jul     90   106    110     95     81     69     85
Hams Fork River
  Frontier, nr, Pole Ck,   Apr-Jul     38    70     55     47     33     30     54
  Frontier, nr, Pole Ck,   May-Jul     32    67     49     41     27     24     48
  Viva Naughton Reservoir  Apr-Jul     50    68     72     59     43     41     74
  Viva Naughton Reservoir  May-Jul     40    65     62     49     33     31     62
Green River
  Flaming Gorge Reservoir  Apr-Jul   1050   107   1340   1190    970    790    980
  Flaming Gorge Reservoir  May-Jul    815    96   1100    955    730    550    845
Little Snake River
  Slater, nr               Apr-Jul    164   105    205    175    149    131    156
  Slater, nr               May-Jul    140   101    182    151    125    107    138
  Dixon, nr                Apr-Jul    365   106    465    390    320    285    345
  Dixon, nr                May-Jul    300   102    400    325    255    220    295

Bear River Basin
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Bear River
  Utah-Wyoming State Line  Apr-Jul    129   115    149    137    123    118    112
  Utah-Wyoming State Line  May-Jul    121   116    141    129    115    110    104
  Woodruff Narrows Rsvr,   Apr-Jul    143   118    170    150    132    127    121
  Woodruff Narrows Rsvr,   May-Jul    111   106    138    118    100     95    105
  Montpelier, nr, Stewart  Apr-Jul    161    88    220    185    150    136    182
  Montpelier, nr, Stewart  May-Jul    123    85    182    147    112     98    145
Smiths Fork River
  Border, nr               Apr-Jul     76    85     88     80     72     65     89
  Border, nr               May-Jul     67    84     79     71     63     56     80

50% Most probable volume in 1000 acre-feet.
%AVG  Most probable volume in percent of the 1981-2010 average.
10% Volume that has a 10 percent chance of being exceeded.
30% Volume that has a 30 percent chance of being exceeded.
90% Volume that has a 90 percent chance of being exceeded.
70% Volume that has a 70 percent chance of being exceeded.
AVG   average volume for the 1981-2010 period.

All forecast volumes reflect natural flow.  Actual observed flow may
be affected by upstream water management.

CBRFC/Nielson,Kormos



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